<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <style>
    #l1{
      color: darkgreen;
    }
    .c1{
      color: blue;
    }
    .c2,.c1{
      background-color: yellow;
    }
    input[type = submit]{background-color: red}
    input[type = button]{color: deeppink}

    *{
      border: 100px solid red;
    }
  </style>
</head>
<body>
<ul>
  <li id="l1">张学友</li>
  <li class="c1">刘德华</li>
  <li>郭富城</li>
</ul>
<h1 class="c1" >悟空</h1>
<h1 class="c2">八戒</h1>
<h1 class="c2">唐僧</h1>
<h1 class="c2">刘备</h1>
<input type="submit">
<input type="button" value="按钮">
</body>
</html>